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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23ed21d83b9907de194dad0a735c984847e00c418955826f6d3e56ffc5ee11b' 
  AND token = '1hXptUgw9cynaHx3a6v8KSm+KGEOC2Wp6l43FypGABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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