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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80171fd7fc060c7a89001f300ac4f65aa59fadefe6826ba38ab85d24da4b54e0' 
  AND token = 'kk7jmRsXz27hqaZupp3hM33BNmyjUuHXkIOV6h8ON9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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