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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d8c49ca3e4519ab6595afdbc1ad23a4d3d2df3e4d4fd158e072ffab73411a9' 
  AND token = 'PeXVNO4qiRJRGJeltHwF+/ULc2rhaFKACAX5g1daqMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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