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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07135efb2314851fb8ab13e7dd3b80070a69e31d9a6890085ce18854045e78c8' 
  AND token = 'aj2rylOQcGF6dqlRCNlEW+GvFy4DOWiIiJShQ8xouR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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