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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145f073562e7a188e671fd682de4cdf971c0434699d4786a74d1c117a903cef7' 
  AND token = 'Huc2WJEBqaEMKiIOYHJBiOJ9loWVcs3qqT3fRbKA38w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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