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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2813108049bcaeac3a283dab9bc5906875c330749d9d2b37b601a9aff4d4d4' 
  AND token = 'hxcHiAcX5GU3AmAxeaJ+KDOXhSU2KWANGyXCLPX7Up8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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