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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac9c3ca234ad7e57695f46dfa80b8d78b993d80c8df0ebd394093a59b88708b' 
  AND token = 'UoG7P/pUtVL4IBLo2rCiDtsKLEmnSQtnQHAl8Dx9D9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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