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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4518cb28e0b7de77b0778bd24e000f70405c8a67da003f1840cd8ea5c65f16d' 
  AND token = 'ijrHdyT/X1J01Oqtm7EGaS+uUOLZRSXlPPjk30ZcMNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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