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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73e148be2f647f948bf640fc8eb6b5eb5f7594f5e743aa81adb71a034a800c0' 
  AND token = '41abcjLu97oF+c2D0wiB0p7tasKjvYUGXGUtfK0rt2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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