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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d06fb951fdf67b0909942aa5098379f1ec05a3aacebb6cce8ee1f0a5ca0df5' 
  AND token = 'ry9cbRPuecp889wPb2F/f9USgYsUwMCfiAJoHZY18rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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