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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9e9538d656e907f71feb0ad0579c7d4bc0867b0ff9a7f07d523a72d5c9c195' 
  AND token = 'q76E6mTtO9kwkkTXD900rOw92CDfBqV5W26bEZMMnbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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