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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7867bd7caa65072a597252ffe625c064328879dfbf4c9c96fc8f8bb3bc37450' 
  AND token = 'px+b+k3mhtm6mqagOtAIvuZigx6+TFrq5F5qs7ocis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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