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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707c61e0da3847cc3355be8433b1a8ee0234fafba86557d75b9e8009107becad' 
  AND token = 'h0nmAHp1YNT3HA5CDEOznKHq7RtcB44+mZ+ckLvcFhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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