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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796b957b82a2601de7ba52e8a097f535df2c0ed72d0ff27b3f1964986bc1e054' 
  AND token = 'VJYcrQGOEnF4r37iumADxwJkAnuC5HWfU9k2F/KaP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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