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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99e6bb5dabafcb78c55fc42c20c72da110001b0f5b5f24f9770b5a2bc60646f' 
  AND token = 'CdPbYxvq049qgdhIAkVdtUVBREB6CvYej3bBHFLCOFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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