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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c3e858ae9997bf8ca96dc8182caf30f453fe1a419326a8cbea935598bf3b0c' 
  AND token = 'ub7/IkD+y5ly9kivh/wrKjSCG5mHpCUsbHUhcTbkdpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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