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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8842c2ea6b744526ac4736dec9160fad800f971f5946b3f9dea363398620c191' 
  AND token = 'uh2N1oZbBWDJTD33xHXU448jDCSUb5glDRb2FNNa2qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}