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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43edef296d7344897b7109219ead65758f73337128bfa3475755c607357bdefe' 
  AND token = 'VmZImgTVzN3VEp1fkvQuGnKfiNSG/wro98kxFG8u9O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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