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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1171c42ac4defccc5e266423fc665192777d23d120bb5d626da00750cf11cefc' 
  AND token = 'QLVHsBGw18xbtv6V4lJYoAb009kAyE4S2d0Mrg00c0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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