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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83660a95245579be2db0916e0b7297471a321bc45e7d888d9d1a00cc55795bf3' 
  AND token = 'aR3zBdtohvaQ8gqO2R8t0BZ7mjB4LyusFFM1XLGOP5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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