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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b15dbc8dd9456896a508d4e173063bd83b1f8ba4c54ed8fe877031133fb1c2e' 
  AND token = '1kZXEognUFRg2gB9S+Lr2vD0p5+TxmOmObal9IP+y4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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