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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7b57686bacd055c01c7ec245273066a4f4f2b30b2acc1d82ed941b2bcea4c3' 
  AND token = 'daj5EuJ/hcu265k/a06CC/K+JiL9rWu+tR6tf84rHZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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