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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dca6db7e9dd4f9bb6dec8d749e0bf9b985dcb12a0187dfd7c413a4755fd6f4f' 
  AND token = 'ysTIVJmSnrGS41EECkRBsWrG2QpnVAV4V2u0kx8UaGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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