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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe1c7a594ff5473b1f9fe8b2b6a6dfa75c25369bcb6578c72fa74056f15c0e3' 
  AND token = 'OXcSm2HW9ACa2Hej2FTndfjb1GBFfc4KZySjAdgXeYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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