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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bec78ec66632565709946b03917134ccbb341a7d4e83f0bd8aa0caeb7f06f77' 
  AND token = 'sItnpGYtCIgjbturfaw+0/yaud25C16LcWe913/zllk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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