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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef73d05c26fce07c25d0ce8d3d69f398646375f57ade5e0b8c443d56b1363d00' 
  AND token = 'jZX9qPtXRBqCx7lMflc7mOs886RucXFmGytjqkCq3PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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