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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad190ba902e42cc24b4d77f11ec82c7b122b2fdbcdfe642375bb856c67cb260e' 
  AND token = '8+H1rvTC1/yzP4nye48kH5cVJjro+oeWeqYijeJSObo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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