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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b37f465b3a359f59bb7af0bd0d979eee57d0b8f028b3085cebeb4fc55173d6c' 
  AND token = 'QYIQ/QpZ6tKXW0t6K9z1VJfbwTmv1R9VvJ/vfVhd2ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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