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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f38bedecdb25f3f894b4885959c532e19652c49338f84fb670d58bf3921b50' 
  AND token = '5ZQ8wCZ4i62iOi+ev4oSEWUIIdaQLT14TL8CTl77I5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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