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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '457177f82dc4ce3e8aa98e765f3c9cee0af6368bbc1c2f1da69bafcff30fc1e0' 
  AND token = 'jeLDcgJPpL0Lv3ODGdAb6gN454g58IRwY+wCPwXoClI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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