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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc2fbf28e916c5ea323db4ec924d56b00f2e4805cdac064ee85d2cbd822f6c2' 
  AND token = 'X72OCmpt9VThjI/LMw9/benUUq9YYcWb73dPtV086UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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