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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56cfa15aa8438c5afec2a7397370bd6d914ed70915a49f5266354953a7a97d5' 
  AND token = '+QvRwbOs6BAXYQ8bEUrjim36Gkd8XqRkMDHopETwx7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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