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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c815494657b3232c0055ed5202e44dd1797fed65fe3148f67ca36ba6a2c0f619' 
  AND token = 's2FnmlpQk9yiqbGYTU1hJYvlkTot9v5t/AOVo49IFi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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