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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf5258653439b49c4526f5db424a481056d38ad237ec38e1ae7e7c142886572' 
  AND token = 'Ch9i+qnIiqTMu+5WB66NJk4X2kWb9sRj9FTjX+GHti8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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