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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd1e8d56302e0d4971b18f2fd83f80b092b4d10fe44d88d49c6d7fd21fd437e' 
  AND token = 'nRvLPTkzCWtVwXG1Ds3t4WRFSF+CJPLKnHYxUMu14ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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