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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfe72841799610d9e4d54f5e3a06d8bcd7c597447ceac38fa686828ecf4cfe0' 
  AND token = 'n2Jw/J07kP28i83tmWXNSbQYmI2Y+Tj+t48hLo0rhlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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