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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e773c7bc2c8021f4cbb422a7d65ff2cf2d01ecf801b8b3a47b97b680f7133217' 
  AND token = 'lg7wKtz8yOgvKrqSe92HWzIzxrGNO/GpQh+t5tUWDaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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