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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1053b4eb8a044e3086cbb5c1e8fe73a3c0eab449bf5add2d371be357055d450b' 
  AND token = '7oYi1Y8XQRUhmVJVyAj0L2SRDIv1VR+hGuHOp5eN01U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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