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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb77803636c9919fbe28d238b2f6bb71b2a4ead342a32ca7c97843bb9a841c3' 
  AND token = 'a0+5fT4IdGuhFkPsQlXbKRAGn61+8R2dFpwyjZJrc7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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