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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f18dd65c695b966df2b3ad0559bf2f2f6f3bbfc9ede5a1dfcd73436e8fdb9d' 
  AND token = 'KLjqL2oUqt+8cfVKiR5HTA0XUSsW2Li8bQoaEE7GUrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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