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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6bf5812085a96a384e32b0ac8c9bf9d8740a2b6aff0937954d826eed7c70eba' 
  AND token = 'gkHJ0F7Rg1AznThoBBdqQaZlFXPxOiIIqNLgNOoN3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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