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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56327f1026e07d4b5586dd88232aa92363f03324ff56872165737bb231af184' 
  AND token = 'FY0gRXUsEjcmBEw2C0zHKYrK37cfjIKqJB0dcLR7xXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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