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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd69b39a4ecc00324f9b91c44449bb0da2fa774b250b0e8a659ff939c917a33c' 
  AND token = 'Yngy22CvpuCAcAHsUYmHGUu3imeZDslttit6h5ZCwMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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