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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b063bb82158f11f4d9e4db950bef69284619bcc058a292b783fd9462d29d3f80' 
  AND token = '3ubk67MAgQXPPDtDBfb5PjJuCRdkc2yTNbzPoG7njzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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