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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e542a4815d77d5f85bed8cdce89eadc46432caa1c22a92199c0a9d8fab97fcf' 
  AND token = 'af52rDirjUj4aXetK6LS6jcmxW+lXOfiT6r/DQyvzec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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