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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4351089dbd8d1d826ed792e7534d86cfb488f77e9e91e2caea21029dfa2d369' 
  AND token = 'b8GNqkDQIqFo4/q26/1CNoEEjqzEPwxj/tRIQB7BoYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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