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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184faf2e40b604c3b42469ee92d2fd47d60368c6ead461c3fea459800b5ae6e2' 
  AND token = 'M1rfI6A9IYNLF/LziBIyHsergcEUpzhu4nw3BOrHwG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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