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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0368756ea7289e052852cbf689f5032e70f8861541d99fe2627036fdadd6f1a' 
  AND token = 'Kldb5+FzFt4ZO25xSCxALk/lOcNHbyVXBu0a8f8bv2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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