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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a691ce6d463aaa0ddfa0d5bed5e629a2269226bbad4393667697790c200263fb' 
  AND token = '3A+JGg+mnb4KwQ0qpI9E0gHHS0HMKXysa92cRd+UkEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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