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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb07fed8f3321d16223aebed109fa6fed8a768a8ef7983c2eefcfc9cf5cb46da' 
  AND token = '2vbh5cVgKvfbBqea+Di8y/89bwKMYRuR1sQqExLzLSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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