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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712c361b3a4ad2f548a157e55bf7cf831cd2b206cf1d76f0adc3692b06382a42' 
  AND token = 'M9K8xTy+iBEjYcAif/2IMg/0+gtl0aUJWC1jEjjJAPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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