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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a180c6baca9478fa5e50a58540ea9770262538714c7409bf2aedd733967ce233' 
  AND token = 'uDWxUn/JdM9giYn0fVfXdtAnFpH812HUMUBOEkTi9Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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