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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb393c9fc59233787efb4a68e9bcdc644e97daf81b849c09a6f4bacf6ded7f1a' 
  AND token = 'AgzEQx1BIPbnoR786pciCmZhiseG+LRQuovIiDLtKOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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