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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40653fd0dcbd9aac4344b6560b96cca3cfd3b259eff8f8a24b007927d3b3174c' 
  AND token = '8UFdACaqKiM4ZNO0FPduergdx2T/ydeOoPV5KLKA8uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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