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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df21681fca37dd912772088c4f460866c0b062267dddcb8b988a3fcf4ddc5cd' 
  AND token = 'ZvArXd79Qk57vUSjvV45BALAbD47iu3Ts3aXoWrVamY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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