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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7df945a9f2167b0c77883ffec6072c8bdb8b2937023cf240aae695ea807ac6' 
  AND token = 'mDV8AWlqfUGDIA+Ggupyqck1wE5VFLd9CrITF0DbANw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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